Chimney-cap



(1410 Model.)

T. W. EMERY 8v W. SPENCE.

GHIMNEY GAP.

No. 372,017. Patented Oct. 25, 1887.

. a m L QMWOQQO n kum bv ISI UNITED STATESv PATENT Trient.

THOMAS WILLIAM EMERY AND WILLIAM SPENOE, OF MINNEAPOLIS, MINNESOTA.

CHIMNEY-GAP.

SPECTPICATION forming part of Letters Patent No. 372,017, dated oeteeez25,1887.

Application filed March 15, 1886. Serial No. 195,232. (No model.)

T0 all whom it may concern:

Be it known that we, THOMAS WILLIAM VEMnRY and WILLIAM SPENcE, citizensof the United States, residing in Minneapolis, in the county of Hennepinand State of Minnesota, have invented an Improved Ventilating andDraft-Accelerating Cap for Chimneys, VentilatingShafts, and other Uses;and we do hereby declare that the following is a full and exactdescription of the same, reference being had to the accompanyingdrawings, making part of this specification.

Figure l of the drawings represents a side View of the cap as applied tothe top of a chimney; Fig. 2, a top view ofthe same; Fig. 3, ahorizontal section looking downward in a plane indicated bythe line l l,Fig. l; Fig. 4, a cen-A the respective Afaces of this upper band aretral vertical section thereof.

Like letters designate corresponding parts in all of the iigures. .f v-f The forin'of the base of this cap, as shown iu the drawings,isrectangular, and this is the form adapted to most chimneys; but a roundor some other form maybe best adapted to some other places, and theinvention is equally well adapted to such other forms.

The entire body of the cap is easily, cheaply,

i and preferably made of a simple piece of sheet metal cut in blank tothe proper form and then bent into the required shape, and the meetingedges of the sheet metal soldered or otherwise joined, preferably at onevertical corner.

, The base A of the cap forms a band, which in the present case tsaround the entire top of the chimney B, and is secured there by a simplefrictional pressure, orwith .the assist; ance of bolts or other means ofattachment. Just above the top of the chimney, or at the upper edge ofthe band on each side, a section, O, is cut from the sheet metal,separated therefrom at three edges, all except where it is connectedwith the band A below, and these sec- .tions are narrowed from bottom'to top, as

united by solder or otherwise to give strength and stability to theform. The aperture at the upper edge of the frustum is equal to orsuflicient for the size of the fiue or flues of the chimney below.

The sections eut away to form the frustumcase, as above set forth, leavethe corners of the cap connected with the base-band below, and thesecorners compose the standards D D, which support the upper parts of thecap. If the cap is round, then, instead of there being corner standards,there are simply integral portions of the sheet metal alternatingbetween the frustum sections to `form the standards. To the'upper endsof these standardsis joined an upper band, E, extending around thecap,and at the upper edges of outwardly turned and obliquely situatedanges or wings G G, of curved or any other ornamental form, as shown, orotherwise. This upper band serves to stop the progress of the wind orairburrent which strikes the cap, eX- cept what passes through theopenings formed by cu'tting'out the frustum-sections, and all ythe airthat impinges upon the inclined surfaces of the frustum within isthereby directed upward and out through the open top of the cap, therebyproducing or greatly increasing an upward draft from the chimney-finesor Ventilating-shaft under and within the cap by the fricticnal contactof the two joined currents of air. The outwardly-inclined wings G Gdirect downward and through the side openings in the cap additionalportions of the air-current, and on the lee side they assist indirecting the draft upward and outward.

In connection lwith this cap and main ventilator we add a shield-cap, H,which is placed in the open top of the main cap, and is helddirectly'ove'r the opening in the top of the frustum, and covers thesame, being ofproper form to fulfill this purpose.l The upper surface,a, is convex, or has inclined sides, the form for a cap of the shapeshown in the drawings being that of a broad low pyramid. This formserves to shed the rain and snow and to direct the same outward, so asnot to fall inside of the main cap. The under surface, b,

of the shield-cap is also convex, and may be IOO of the same shape asthe upper surface and lowest in the center. Having this form, it notonly does not impede the upper discharge of the commingled air and draftcurrents, but assists in directing them upward and outward, and bycontracting the space over the frustum of the cap increases the force ofthe draft from the chimney or ventilator. This shield-cap is held inplace by narrow metallic strips or rods c c, which are secured to theupper band, E, or its wings G G, as shown in the drawings, or may beattached to thesides of the frustu m. By using bolts and nuts d d forthe attachment, or other equivalent means, the shield-cap may be readilyremoved for cleaning chimney-dues without removing the whole cap to gainentrance to the iiues.

In addition to the shield cap, as above set forth, we in some cast-s,where sparks are to be kept from escaping from flues below, placewire-gauze screens I I over the spaces between the shield-cap and thefrnstunl or contracted cone beneath it, as shown in Fi g. 1.

It is to be understood that this Ventilating and draft-producing cap isapplicable to many uses, as for chimneys, smoke-stacks, ventilators ofall kinds, as for houses, cars, steamboats, sailing-vessels, vaults,basements, &c.

In case two or more chimney or ventilator tlues open into the same easeor frustuln, as shown atff in Figs. 3 and 4, in order that the draft ineither flue may not overpower that in the other or others, and toequalize the same, we place a partition or partitions, K, between theues, inside of the frustum, reaching from the top of the chimney orventilator to the top of the frustum or thereabout, and in order tosecure the best ecct, and even to increase the draft of each flue, thisportion is preferably inclined correspondingly to the opposite sides ofthe frustum, as shown in Fig. 4; and to still further render the actionon the draft of one flue independent of that of the other, we preferablyplace wing-partitions L L outside of the frustum, opposite to thepartition K within, as shown in Figs. land 4.

We are aware that a chimney-cap contracted in size from the top of thechimney upward, having a larger band or case around its upper endextending downward considerably below the upper edge of the said cap,and a shieldcap over the said cap, with an open space between the caps,is not new.

\Ve claim as our invention'- 1. A Ventilating or draft-producing capconstructed with upwardly-contracted case, side openings opposite to thesame, band above the openings supported by standards between theopenings, and outwardlyturned wings at the upper edge of the top band,substantially as and for the purpose herein specified.

2. The combination of a chimney or ventilator having two or more flues,cap over the chimney formed with upwardly contracted ease or frustum,shieldcap over the open mouth of the same, and partition or partitionswithin the frnstuin between the fines, substantially as and for thepurpose herein specified.

3. The combination of a chimney or ventilator having two or more fines,cap over the chimney or ventilator formed with an upwardly-contractedcase or frustum, shield-cap over the open mouth of the same, partitionor partitions within the frustum between the filles, and wing-partitionsoutside of the frustum and opposite to the interior partition orpartitions, substantially as and for the purpose herein set forth.

In testimony whereof we have hereunto set our hands in presence of twosubscribing witnesses.

THOMAS WILLIAM EMERY.

WILLIAM SPENCE. Witnesses:

Guo. W. EMERY, Louis Fnnsna, Jr.

